MLA

Erdoes, Richard, 1912-2008. Pecos. Box 55 | Pueblo; People, Adi, Ency, Tesuque, Hospital, Pecos, Zuni, Denver-Albu Murals, San Juan Xmas, School, Sioux in Safe. 1975-1977, undated. https://collections.library.yale.edu/catalog/2084154.

APA, 6th edition

Erdoes, Richard, 1912-2008. (["Box 55 | Pueblo; People, Adi, Ency, Tesuque, Hospital, Pecos, Zuni, Denver-Albu Murals, San Juan Xmas, School, Sioux in Safe"])(1975-1977, undated)[Pecos]. https://collections.library.yale.edu/catalog/2084154.